This article responds to commentaries (EC 604 996-998) on a paper by Douglas Detterman and others (EC 604 995), which developed and tested a modal model, with young adults with and without mental retardation as subjects, to assess basic cognitive abilities in relation to cognitive deficits. (JDD)

This commentary on a paper by Douglas Detterman and others (EC 604 995), on assessing basic cognitive abilities in young adults with and without mental retardation, argues that variables measuring correct responding and variables measuring response latency or speed are two aspects of the same underlying continuum of speed and efficiency of…

This article comments on the reporting by Douglas Detterman and others (EC 604 995) of a larger magnitude of g among young adults with mental retardation. Reliance on g-based measures for screening and diagnosis may thus be misleading, by implying that those tested were less differentiated than may be the case. (JDD)

Many variables mitigate against a culture-fair test being devised. The Queensland Test--which has been administered to Aboriginal children--is probably fairer than most IQ tests, although it appears to measure the degree of contact with Western culture (implying socio-economic variables) rather than mental and chronological age or cognitive…

This paper addresses the problem of heterogeneity of samples of learning disabled (LD) children by comparing five different systems for identifying homogeneous subgroups in terms of their ability to predict longitudinal reading and mathematics scores. One hundred and sixty LD children served as subjects. Three of the five subgrouping systems were…

Today's tests of intelligence are largely unchanged over the past 70 to 80 years, despite substantial changes in the way intelligence is conceptualized. The history of intelligence testing reveals that much more has been done to perfect the measurement of traits that are static and immutable than has been done to make or keep intelligence tests…

The Wechsler Intelligence Scale for Children-Revised (WISC-R), one of the most commonly used tests of cognitive ability, is difficult to administer accurately. The purpose of this study was primarily to assess interrater agreement on the WISC-R Administration Observational Checklist (WAOC), a new observational instrument that can be used by an…

This study was conducted to determine how the pattern of learning on an abstract concept, plate tectonics, differed between groups of different cognitive levels, sex, and intelligence quotient (IQ). The intensive time-series design was used to examine the achievement of eighth grade and ninth grade earth science students. The unique characteristic…

This paper argues that using intelligence as an aptitude benchmark in defining reading disability conceals unsupported assumptions about educational potential and makes it difficult to differentiate the cognitive characteristics of dyslexic children from those of other poor readers. The use of a more educationally relevant aptitude measure such as…